Easy Apple Turnovers

Name: Easy Apple Turnovers
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: American
Ingredients: 2 tablespoons of butter (vegan as desired); 4 medium apples (peeled and chopped (about 1.5 pounds)); 1/3 cup of packed light brown sugar (coconut sugar would also work well!); 1 ½ teaspoons of cinnamon; ¼ teaspoon of nutmeg; Pinch of all spice (optional); 2 tablespoons of cornstarch; 1 sheet frozen puff pastry (thawed); Milk of choice for brushing (about 2 tablespoons); turbinado sugar for sprinkling (optional)